Make(1) does not support file inclusion +Fix

[Mohamed_el_Lozy]

The two postings about make seem to have something missing.  Applying
the first patch will produce a program that fails to link, with
do_include() missing.  If -DINCLUDE is removed from the DFLAGS it will
make properly.  I very much suspect that do_include() should live in
files.c, and there are no patches for that file.

The second posting (which adds RCS compatibility) confirms that
impression.  There is a patch which takes files.c from 1.3 to 1.4.  It
takes, apart from the headers.  Like after the first patch, compilation
fails with do_include() missing, but works if you remove -DINCLUDE from
DFLAGS.

Since I do not care about the include capability, I am perfectly
satisfied.  Others may want it.